------- Comment From [email protected] 2018-04-05 07:34 EDT-------
Issue is resolved in 4.15.0-15-generic kernel.

root@ltc-wspoon4:~# ppc64_cpu --smt
SMT is off

Starting Kernel crash dump capture service...
[   11.747657] kdump-tools[952]: Starting kdump-tools:  * running makedumpfile 
-c -d 31 /proc/vmcore /var/crash/201804050626/dump-incomplete
Copying data                                      : [100.0 %] \           eta: 
0s
[   27.390223] kdump-tools[952]: The kernel version is not supported.
[   27.390438] kdump-tools[952]: The makedumpfile operation may be incomplete.
[   27.390563] kdump-tools[952]: The dumpfile is saved to 
/var/crash/201804050626/dump-incomplete.
[   27.390726] kdump-tools[952]: makedumpfile Completed.
[   27.405543] kdump-tools[952]:  * kdump-tools: saved vmcore in 
/var/crash/201804050626
[   30.762418] kdump-tools[952]:  * running makedumpfile --dump-dmesg 
/proc/vmcore /var/crash/201804050626/dmesg.201804050626
[   30.802776] kdump-tools[952]: The kernel version is not supported.
[   30.802923] kdump-tools[952]: The makedumpfile operation may be incomplete.
[   30.803025] kdump-tools[952]: The dmesg log is saved to 
/var/crash/201804050626/dmesg.201804050626.
[   30.803145] kdump-tools[952]: makedumpfile Completed.
[   30.803263] kdump-tools[952]:  * kdump-tools: saved dmesg content in 
/var/crash/201804050626
[   30.888353] kdump-tools[952]: Thu, 05 Apr 2018 06:26:24 -0500
[   31.035631] kdump-tools[952]: Rebooting.
[   31.126613] reboot: Restarting system
[ 1577.265030518,5] OPAL: Reboot request...

root@ltc-wspoon4:~# ppc64_cpu --smt
SMT=2

Starting Kernel crash dump capture service...
[   13.378626] kdump-tools[952]: Starting kdump-tools:  * running makedumpfile 
-c -d 31 /proc/vmcore /var/crash/201804050631/dump-incomplete
Copying data                                      : [100.0 %] |           eta: 
0s
[   27.102530] kdump-tools[952]: The kernel version is not supported.
[   27.102659] kdump-tools[952]: The makedumpfile operation may be incomplete.
[   27.102787] kdump-tools[952]: The dumpfile is saved to 
/var/crash/201804050631/dump-incomplete.
[   27.102910] kdump-tools[952]: makedumpfile Completed.
[   27.112064] kdump-tools[952]:  * kdump-tools: saved vmcore in 
/var/crash/201804050631
[   29.632162] kdump-tools[952]:  * running makedumpfile --dump-dmesg 
/proc/vmcore /var/crash/201804050631/dmesg.201804050631
[   29.672730] kdump-tools[952]: The kernel version is not supported.
[   29.672890] kdump-tools[952]: The makedumpfile operation may be incomplete.
[   29.672997] kdump-tools[952]: The dmesg log is saved to 
/var/crash/201804050631/dmesg.201804050631.
[   29.673111] kdump-tools[952]: makedumpfile Completed.
[   29.673249] kdump-tools[952]:  * kdump-tools: saved dmesg content in 
/var/crash/201804050631
[   29.774672] kdump-tools[952]: Thu, 05 Apr 2018 06:31:40 -0500
[   29.913780] kdump-tools[952]: Rebooting.

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https://bugs.launchpad.net/bugs/1758206

Title:
  Ubuntu 18.04 [ WSP DD2.2 with stop4 and stop5 enabled ]: kdump fails
  to capture dump when smt=2 or off.

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